1 /* 2 * Copyright (c) 1983, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #if defined(LIBC_SCCS) && !defined(lint) 35 static char rcsid[] = "$OpenBSD: readdir.c,v 1.5 2001/05/17 20:20:36 rees Exp $"; 36 #endif /* LIBC_SCCS and not lint */ 37 38 #include <sys/param.h> 39 #include <dirent.h> 40 #include <string.h> 41 #include <errno.h> 42 #include "thread_private.h" 43 44 /* 45 * get next entry in a directory. 46 */ 47 struct dirent * 48 readdir(dirp) 49 register DIR *dirp; 50 { 51 register struct dirent *dp; 52 53 for (;;) { 54 if (dirp->dd_loc >= dirp->dd_size) { 55 if (dirp->dd_flags & __DTF_READALL) 56 return (NULL); 57 dirp->dd_loc = 0; 58 } 59 if (dirp->dd_loc == 0 && !(dirp->dd_flags & __DTF_READALL)) { 60 dirp->dd_size = getdirentries(dirp->dd_fd, 61 dirp->dd_buf, dirp->dd_len, &dirp->dd_seek); 62 if (dirp->dd_size <= 0) 63 return (NULL); 64 } 65 dp = (struct dirent *)(dirp->dd_buf + dirp->dd_loc); 66 if ((long)dp & 03) /* bogus pointer check */ 67 return (NULL); 68 if (dp->d_reclen <= 0 || 69 dp->d_reclen > dirp->dd_len + 1 - dirp->dd_loc) 70 return (NULL); 71 dirp->dd_loc += dp->d_reclen; 72 if (dp->d_ino == 0) 73 continue; 74 if (dp->d_type == DT_WHT && (dirp->dd_flags & DTF_HIDEW)) 75 continue; 76 return (dp); 77 } 78 } 79 80 int 81 readdir_r(dirp, entry, result) 82 DIR *dirp; 83 struct dirent *entry; 84 struct dirent **result; 85 { 86 struct dirent *dp; 87 int ret; 88 89 if (dirp->dd_fd < 0) { 90 return EBADF; 91 } 92 if ((ret = _FD_LOCK(dirp->dd_fd, FD_READ, NULL)) != 0) 93 return ret; 94 errno = 0; 95 dp = readdir(dirp); 96 if (dp == NULL && errno != 0) { 97 _FD_UNLOCK(dirp->dd_fd, FD_READ); 98 return errno; 99 } 100 if (dp != NULL) 101 memcpy(entry, dp, sizeof (struct dirent) - MAXNAMLEN + dp->d_namlen); 102 _FD_UNLOCK(dirp->dd_fd, FD_READ); 103 if (dp != NULL) 104 *result = entry; 105 else 106 *result = NULL; 107 return 0; 108 } 109